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Posted to log4j-dev@logging.apache.org by "Gary Gregory (JIRA)" <ji...@apache.org> on 2016/09/20 00:13:20 UTC
[jira] [Resolved] (LOG4J2-1597) Add a ScriptAppenderSelector to
create an Appender specified by a Script
[ https://issues.apache.org/jira/browse/LOG4J2-1597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gary Gregory resolved LOG4J2-1597.
----------------------------------
Resolution: Fixed
Fix Version/s: 2.7
In Git master.
> Add a ScriptAppenderSelector to create an Appender specified by a Script
> ------------------------------------------------------------------------
>
> Key: LOG4J2-1597
> URL: https://issues.apache.org/jira/browse/LOG4J2-1597
> Project: Log4j 2
> Issue Type: New Feature
> Components: Appenders
> Reporter: Gary Gregory
> Assignee: Gary Gregory
> Fix For: 2.7
>
>
> The use case is to create an OS-based dynamic configuration file.
> The script determines which appender to use (once), and instantiates that appender (once). There is no need for one appender to delegate to another appender.
> This feature helps you build your configuration dynamically, all from the configuration file, to determine which appenders to configure. This is different from using a RoutingAppender which creates a level of indirection and decides what to do for each log event _at runtime_.
> You can use multiple ScriptSelector Appenders if needed.
> For example:
> {code:xml}
> <Configuration status="WARN" name="RoutingTest">
> <Appenders>
> <ScriptAppenderSelector name="InitAppender">
> <Script language="JavaScript"><![CDATA[
> "OSNameFoo".search("Foo") > -1 ? "List2" : "List1";]]>
> </Script>
> <AppenderSet>
> <List name="List1" />
> <List name="List2" />
> </AppenderSet>
> </ScriptAppenderSelector>
> </Appenders>
> <Loggers>
> <Root level="error">
> <AppenderRef ref="InitAppender" />
> </Root>
> </Loggers>
> </Configuration>
> {code}
> The new plugins are ScriptSelector (an Appender that builds a different ScriptSelector) and AppenderSet, a plugin with deferChildren set to true.
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